Add thread-safety to creation of MemCopy and modulo functions.

src/api.cc

Index: src/api.cc
diff --git a/src/api.cc b/src/api.cc
index fb827f2f727d97e6a50217b9a5a1cc60ed7b4b0a..61838e3fd6116df46c212b004d837d09385344a8 100644
--- a/src/api.cc
+++ b/src/api.cc
@@ -1302,7 +1302,7 @@ ScriptData* ScriptData::New(const char* data, int length) {
   }
   // Copy the data to align it.
   unsigned* deserialized_data = i::NewArray<unsigned>(deserialized_data_length);
-  i::MemCopy(deserialized_data, data, length);
+  i::OS::MemCopy(deserialized_data, data, length);
 
   return new i::ScriptDataImpl(
       i::Vector<unsigned>(deserialized_data, deserialized_data_length));